Thread: 4T65-E (and HD) ID TAG deciphering info

Originally Posted by 04GPCOMPG

How would I know if I have the HD trans or not? I found the tag, and found the "code" but what I see does not match what's on the list. I took a crappy pic with my phone, but I don't know how to post it. All that it says is just "4CB" there is no "CAB" OR "CBB". Can anyone help?

Sounds like you have a "4CBB" trans, which equates to a 2004 4T65-E NON-HD unit with 3.29:1 overall gearing.

If you don't have the supercharged engine, then you don't have an HD trans (if everything is factory under your hood and someone hasn't replaced the trans already).

I just built one of these a month or two back and 4CB is the CompG HD trans with 3.29 gearing and tapshift option, so that is correct. It is a different code for the normal GTP as they had the 2.93 gearing and I dont believe they had the tapshift but I could be wrong on that. Ryan the ATSG book has the wrong info for that trans and I wrote it down in my book for future referrence. The correct info for the 4CB trans is Supercharged/JZFM converter/258mm/IMS= Y

Well that is good to know, thanks for your help. So then what makes it different or better?

The Comp G cars got a 3.29 overall ratio vs a 2.93 overall ratio for better performance, the valvebody, seperator plate, and channel plate are specific to the tapshift cars as they use a different shifting strategy than the normal cars. The torque converter is a slightly different stall rating to match the package. The internals are the same as all of the other 4T65Es as far as clutch packs and geartrain